Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 07f52279a6791106…

MALICIOUS

Office (OOXML)

70.1 KB Created: 2018-09-11 13:13:32 UTC Authoring application: Microsoft Excel 14.0300 First seen: 2020-05-25
MD5: 1cae00669bb9ddf35e902ffd188b5d89 SHA-1: 05caa14c93e35bd7c1d01109a5802f4570fbc661 SHA-256: 07f52279a679110655d56b8116af75d9f31d1d35bb99c74265c539b8e3d6d718
120 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The file is an OOXML document containing an embedded OLE object, specifically an Equation Editor object. Heuristics indicate this object is anomalous and exploits CVE-2018-0798, likely to execute shellcode. The embedded object and its associated native stream are the primary indicators of compromise.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/oleObject1.bin contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • CVE-2018-0798 — anomalous Equation Editor native stream high CVE likely CVE_2018_0798_EQUATION_NATIVE_ANOMALY
    Embedded Equation Editor OLE data contains anomalous native stream bytes consistent with a CVE-2018-0798-style Equation Editor exploit. This is treated as likely CVE evidence because the Equation object is malformed and payload-like, but it does not match the exact public matrix-overflow byte signature.
  • Embedded OLE object medium OOXML_OLE_OBJECT
    Document contains an embedded OLE object
  • Suspicious extracted artifact medium EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
SHA-256: e92fcd024dfd0fe5d6686c63374a180662e1ca1084648a40da5f814f41f64cf5
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis found candidate code region(s). Indicators: SC_GETPC_CALL
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OLE10natiVe 1676 bytes
SHA-256: 4f0f87b165b30c7678346f6dc81474ac49fbe6c2eae9756e1955de1255866fd5
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis found candidate code region(s). Indicators: SC_GETPC_CALL

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